Hydraulic bowl release for cone crushers



1964 G. SYMONS 3,162,387

HYDRAULIC BOWL RELEASE FOR CONE CRUSHERS Original Filed Oct. 16, 1957 2Sheets-Sheet l INVENTOR. 10/?! 6. swat 5,

ATTO/P/VZIS.

Dec. 22, 1964 e. SYMONS 3,162,337

HYDRAULIC BOWL RELEASE FOR CONE CRUSHERS Original Filed Oct. 16, 1957 2Sheets-Sheet 2 INV ENT OR. 10,?! 6. sways,

47 ram 1 5.

United States Patent Ofiiice 3,162,387 Patented Dec. 22, 1964 3,162,387HYDRAULIC BOWL RELEASE FOR CONE CRUSHERS Loren G. Symons, NorthHollywood, Calif, assignor to Nordberg Manufacturing Company, Milwaukee,Wis, a corporation of Wisconsin Original application Oct. 16, 1957, Ser.No. 690,458, now Patent No. 3,019,994, dated Feb. 6, 1962. Divided andthis application Nov. 13, 1961, Ser. No. 151,708

17 Claims. (Cl. 241-290) This is a division of my copending applicationSerial No. 690,458, filed October 16, 1957, now Patent No. 3,019,994,issued February 6, 1962.

The present invention relates to an improvement in cone crusheradjusting and release means, and has for one purpose to provide improvedand quickly releasable and yieldable locking means for locking the bowlof a cone crusher against unintended movement in relation to the bowlsupporting ring.

Another purpose is to provide means for quickly releasing such lockingmeans and for thereby permitting quick adjustment of the bowl and ring.

Another purpose is to provide improved means for adjusting the bowl of acone crusher in circumstances where the bowl is in screw-threadedrelation to a bowl support by rotating the bowl in relation to thesupport.

Another purpose is to provide improved releasing means for moving thebowl of a cone crusher when uncrushable material is wedged between bowland head.

Another purpose is to provide improved control means for controlling thebowl adjusting and bowl releasing means.

Other purposes will appear from time to time in the course of thespecification and claims.

I illustrate the invention more or less diagrammatically in theaccompanying drawings wherein:

FIGURE 1 is a side elevation of a typical cone crusher;

FIGURE 2 is a vertical radial section, on an enlarged scale, on the line2-2 of FIGURE 1;

FIGURE 3 is a partial section, with parts broken away, on the line 33 ofFIGURE 2; and

FIGURE 4 is a more or less diagrammatic illustration of a varyingstructure.

Like parts are indicated by like symbols throughout the specificationand drawings.

Referring to the drawings, 1 generally illustrates the base flange ofthe circumferential crusher frame 2. The crusher frame terminates at itsupper edge in a flange 3 having outwardly extending aprons 4, The flange3 has an inner, upwardly conic surface 3a and an outer, generally conicsurface 3b. Conforming to and centered on and normally in fixed relationto the flange 3 is the bowl ring or support 5. This support has an innercomponent 5a which is inwardly screw-threaded as at 5b. It extendsoutwardly and has a circumferential channel, generally indicated at 50,having portions conforming to the conic faces 3a and 3b of the mainframe flange. The ring has also an outward extension or extensions, asat 5d.

In the form of crusher herein shown, the bowl ring 5 is normally helddownwardly against the main frame flange 3 by a plurality of springsarranged in clusters. The upper ends of the springs of a particularcluster are positioned within the apron 4 on the flange 3 and abutagainst the flat lower surface 4a of the main frame flange 3. A lowermovable abutment for the spring cluster is indicated at 6. Compressedbetween the abutment 6 and the lower main frame flange surface 411 are aplurality of springs 7. One spring, indicated at 7a, operates somewhatdifferently from the remaining springs 7 of the cluster, as will laterbe seen. Extending through some or all of the springs 7 are spring bolts8 which may be headed at the top, as at 8a, and which may have securingnuts or other suitable adjustable abutments 8b at their lower end. Byadjustment of the nuts 8b, the compression of the springs 7 may beadjusted. Since the bolts extend through suitable apertures in the mainframe flange 3 and in the bowl supporting or adjusting ring 5, with theheads 8a abutting against the top of the bowl supporting or adjustingring, the springs 7 are effective normally, through the abutment 6 andthe bolts 8, to hold the ring 5 firmly downwardly against the main frameflange 3 in the position in which the parts are shown in FIGURE 2.

The bowl structure proper is generally indicated at 10. It includes anouter, outwardly screw-threaded cylindrical portion 10a which is inscrew-threaded relation with the portion 5a of the adjusting ring 5. Itis shown as having an upwardly and inwardly conic portion 10b which mayreceive a bowl liner 10d and an upwardly and outwardly conic portion100, upon which any suitable hopper or material guide 11 may bepositioned. In order to lock the adjusting ring 5 and the bowl 10against unintended relative rotation, I provide a threaded locking ring12, shown as having a downwardly extending skirt 12a. To preventrotation of the locking ring 12 relative to the adjusting ring 5, theymay be keyed together, as at 1211. The connection between the threadsmay be protected in any suitable way, for example, by the outwardly anddownwardly extending hood 11a which may wipe across any suitable oilseal 11b on the locking ring 12 and a seal 11c between the locking ring12 and the adjusting ring 5. In order to lock the locking ring in place,and to prevent undesired relative rotation of the members 5 and 10, Ifined it advantageous to employ the individual springs 7a. I may, forexample, employ one spring in each cluster, or I may employ springs insome clusters while omitting such springs in others, depending upon therequired locking pressure.

Taking the cluster shown in vertical section in FIG- URE 2 as typical,it will be noted that the spring 7a has a separate washer 14 at itslower end and a separate adjustment or adjusting nut 14a. The abutment 6is apertured or cut away to permit this. The spring bolt 15 of thespring 7a has the washer 14 adjustably secured by the adjusting nut 14a.The bolt 15 is shown as having an enlargement 15a which enters anappropriate cavity in the lower part of the main frame flange portion5d. The parts are so proportioned that a slight'upward travel of thespring bolt 15 is permitted before the enlargement 15a contacts theupper end of the cavity in the portion 5d in which it is positioned.Thus, a slight upward movement of the spring bolt 15 ispermitted,without any movement of the adjusting ring 5. I employ this slightupward movement to permit or effect a release of the locking ring 12.The locking ring is normally urged upwardly by locking levers 16, ofwhich the lever shown in FIG- URE 2 is typical. These levers may befulcrumed on heads 16:: at or adjacent their inner ends which arenotched at 16]) to straddle the heads 8a of spring bolts 8. The shortend of the lever abuts the bottom of the apron 12a of the locking ring12. The outer portion of the lever 16 is shown as apertured to permitthe passage therethrough of an upward extension 15b of the spring bolt15. The nut 150, when the spring 7a and the spring bolt 15 are in theposition in which they are shown in FIGURE 2, operates to exert adownward pressure on the outer end of the locking lever 16, whichexercises a corresponding upward thrust against the apron 12a of Whenitis desiredto adjust the crusher by imparting a rotation'ofth'e bowl16in relationto the adjustingringS; j

12." A slight travelis sufficient; and this travel may be obtained,for'example, by. the use of hydraulic. jacks, such as are'shown at20inFIGUREZ; There will preferably be an individual hydraulic jackv for eachof the spring bolts each jack: constituting thereby 'a release'forone ofthe locking levers 16. The details of the jacks do n'ot ofthemselvesform partof the'present' invention-f It will beundersto od,however, thatthey may be connected by any suitable manifold 21 to' whichthe interior" ofeach jack is connected by any suitable passagez2l. Iprefer to employ conventional spring return jacks sothatt when hydraulicpressure is'admit'tedito the interior: of'the jack, its piston'20arises,'the spring beingeifective to. depress the piston a whenhydraulicpressureis released.

It is thought not necessary to show the" hydraulic system in detail. Iill'ustrate,however; in' diagrammatic form, a valve controllever 25which, when movedin fone'direcr tion or to one position, permits onlysufficient-pressur'e to buildup in the jacks to raisethe spring bolts15' a ,distance'eifective merely to release the lever 16'. I may, forexample, employ-any suitable bypass'valving so, that :the only possibleresult of moving the lever25: in'the: direction 25a wouldjbe to elevatethe. spring bolts 15 as far as they are permitted to rise'withoutlifting. the bowl adjustingring 5 On the otherhand,when thelever-25isrnoved in the direction"25b or toha 'diflerent p osition,;it';willibe understood thatthe valving is effective to permitsuflicientpressure to buildup in the jacks to elevatethe' adjustment ring 5"-ashigh'as thesprings 7 and'7a will permit it: to

feet at thelower edge is of the order of: 4 /2 to S-"ihches.

.v 4 r engage any suitable leverage for, applying forceto thelocking'ring12, as shown'in-FIGURE 2 The rod" 60 has a bottom plate orabutment'63 which is located substantially below the plate 6. The rodpasses through any appropriate aperture 64, centrally located in theplate 6, or so located as-to be on the-general axis ofthe combinedspring thrust of the cluster of springs taken as a Whole.

I A separate spring 65, located below the cluster plate or abutment'e,is compressed between it and the bottom plate 63 of the rod 60, andnormally urges the rod downwardly the locking ring,12 of FIGURE 2.However, when adjustrise. I may say'that the possible excursion in a.known type of conecrusher having a .cone with. a diameterof17 However,the particular size of the crusher, or the particularpermittede'xcursion,are not critical-.-. What I-wishto ,beable .t'o do', and cando by the:herein'described structure, is to employ a set of jacksalternatively to release the locking pressure on the locking ring 12, orto elevate thebowl adjustment ring 5; A purpose for elevating'the ring5'is to permit the interior of the crusher tobe'freed of u'ncrushablematerial which has stalled the crusherq-i It will'be-understood thatinthe normal. use ofthe device, the crushing head, generally indicatedat30; is gy rated toward and away fr'omthe bowl-1t The crushing takesplace as the'result of the'gyration of the head ;within the normallyfixed bowl. In the event that uncrushable P e i '50 material, such as amass of; packedparticles. or a dipper clearance between the bowlandhead. f The blocking'mament orrelease is necessary, hydraulic pressureis admitted to the. jackiefiT-and urges-its operating piston;67upwardlyagainst the. bottom plate. or abutment 63 of the rod 60. Thepiston 67 urges'therod'and the plate'63 upwardly, and'tthe' firstcontact is with/a downwardly extending abutment or: abutments 68'below'th'e plate 6-. This. elevation isrsufiicient toymove the rod-upwardly far enough tov release: the locking:ring':12 of FIGURE '2, oritsequivalent; The bowl: can then be adjusted. If,

7 however, the hydraulic system. ispoperated: to give the maximummpwardmovement:of the: jack: elementr67, then the second contact takes placebetween the rod enlargement 61 and the bowl 'supporting.'ring 5, and;the jack system is effective to lift thawing 5 torthe extent permittedby the full, orssubstantially full, compression of the springs 7: I,FIGURE 4 will; of; course, :be .read as? if the springs 7 were inposition and were:compressed between'the'plate 6zand the mainframeflange 1620f FIGURE 2.

The structure'offFIGURE '4 has certain definite advantages: Q. Forexample, the' thrust'of each jack isibalanced It-willbe, realized thatwhereas I have described and shown a practical and; operative device,nevertheless,

many changesrmay-be made in? size, shape, number and disposition ofparts 'withoutdeparting: from the. spirit of my inventionr I, therefore,wish my description and drawings tojbe taken as in abroad'senseillustrativelor diagrammataicfrathenthan as limitin'g me tomy specific disclosure herein. It will be' understood, for example, thatWhereas I- have illustrateda crusher in which the springs are.arranged.iniclusters, my system maybeapteri-al thennormallypasses'downwardlyfrom th'e cr h,

ing cavity.{ Wlien1the tramp iron or dipper teeth a're'in Volt/ed, andare of too great "a size topass-downwardly through thecavity, they caneasily be lifted upwardlyjout of the bowl l In the form [of FIGURE 4;reinstate an ernate V application of force. The disclosure: can be takensome what diagrammatically, fwith" the main frame and top flange-omittedbut with a rod element 66 illustrated, which passesupwardly through thebottom; of the spring cluster plate; or abutmenteg and passes upwardlythrough it has atop enlargementgel fitting. into. anappropriately formedaperture in-thebottomiofthe'abowl supporting ring 5, and also has anupward extension fig which may I find it' desir'able normally-m rely onthese springsflln adjusting rings, they may bepufatany other desired orpliediequally iwell to -crushers in which the springsare equallydistributed 'infa: single tier aboutthe exterior of the main frame;Whereas Iillustr'atethe jacks 20' as below them'ain frame flange? map-rcourse, below the desirable location; Lik'ewise; whereas I find' itadvantageo'usto apply-thelifting thrust throughthe spring bolts 15 tothe adjusting-ring-5;- by: the use of the heads-15:}, I do not wish tobe limited to this specific arrangement. It will 'be understood, also,thatwhereas 'l'fin'd it advantageous tohaveeach fof the thrust-memberslsor 60 operate initi'allyto 'releaseftheibowl for adjustment; and

' to operate thereafter by a longer travel to elevate the bowl, I maysegregate the system andhave'some members operating to release foradjustment and 'other members operating -torelease the bowl. Y

Theuse' and operation ofthe invention are as follows: Stated simply, Iemploysprings to hold a bowl or bowl support .against' movement;i'ri,--rel'ationto ;'a fmain fframe.

currently employed cone crushers, such springs are used,

' and give adequate service In cone-crushers ,now, on' the market,adjustments, however; are somewhat lengthy and difii'cult-and no meansareprovided for, a quick release of a stalled crusher. My inventionprovides both quick adjustment in normal use and quick release of thecrusher, when stalled, by a hydraulic system which normally idles. Itoperates only when needed. Normally, the springs operate to hold theadjusting ring 5 downwardly against the main frame flange 3, whilepermitting the necessary yielding safety release to prevent breakage andto permit occasional overloads to pass through. However, when adjustmentis desired the movement of the lever 25 in the direction 25a immediatelyreleases the locking ring 12. This permits rotation of the bowl inrelation to the adjust-ment ring 5. If the head is gyrated in the properdirection, the immediate result of such a release of the locking ring 12is to permit the bowl to rotate in response to the movement of the headand the material compressed therebetween. As soon as the desiredadjustment is reached, the hydraulic jacks 20 are released by a returnof the lever 25 to neutral, and the springs 7a resume their normallocking thrust of the lever 16 against the locking ring 12. If desired,additional locking means may be employed, such as any suitable links orconnections, not herein shown, between the bowl 10 and the adjustingring 5.

I claim:

1. In a gyratory crusher, a circumferential main frame with an outwardlyextending flange adjacent its upper edge, a bowl supporting ringtiltably mounted on said flange and movable upwardly therefrom, a bowlmounted on the bowl supporting ring, yielding means for normally holdingthe bowl supporting ring downwardly against said; flange andsubstantially fixed in relation tothe main frame while permittingoverload release, including a plurality of bowl holding and releasesprings, their upper ends abutting the lower side of said main frameflange, movable abutments for the lower ends of the springs, and springbolts passing through apertures in said main frame flange, andconnecting said abutments and bowl supporting ring with said springsunder compression therebetween, thrust members extending upwardly amongthe springs through the main frame flange with a surface opposing thebowl supporting ring, and a plurality of hydraulic jacks positionedabout the main frame relative to the thrust members so that when thejacks are energized, they apply an upthrust to the thrust members whichwill be communicated to the bowl supporting ring, thereby raising thebowl to allow the free escape of lodged material.

2. The structure of claim 1 further characterized in that the surface onthe thrust members includes an enlargement thereon disposed between thesupporting ring and the flange on the main frame.

3 In a gyratory crusher, a circumferential main frame with an outwardlyextending flange adjacent its upper edge, an adjustment ring tiltablymounted on said flange and movable upwardly therefrom, a bowl mounted onthe adjustment ring, yielding means for normally holding the adjustmentring downwardly against the main frame flange and substantially fixed inrelation to the main frame but permitting overload release, a pluralityof' thrust rods positioned symmetrically around the main frame extendingupwardly through the main frame flange, a lateral surface on each of thethrust rods between the main frame flange and the adjustment ring, and aplurality of hydraulic jacks positioned about the main frame relative tothe thrust rods so that when the jacks are energized, they will apply anupthrust to the thrust rods which will be communicated to the adjustmentring by the lateral surfaces on the thrust rods to thereby raise thebowl in order to allow the free escape of lodged material.

4. The structure of claim 3 further characterized in that the lateralsurface on the thrust members includes an enlargement thereon betweenthe main frame flange and the adjustment ring.

5. In combination, a gyratory cone crusher having a circumferential mainframe with an outwardly extending flange adjacent its upper edge, a bowlsupporting ring tiltably mounted on said flange and movable upwardlytherefrom, a bowl mounted on the bowl supporting ring, yielding meansfor normally holding the bowl supporting ring downwardly against saidflange and substantially fixed in relation to the main frame whilepermitting overload release, including a plurality of bowl holding andrelease springs, their upper ends abutting the lower side of saidcircumferential main frame flange, movable abutments for the lower ends,and spring bolts passing through apertures in said main frame flange andconnecting said abutments and the bowl supporting ring with said springsunder compression, said bowl being in screw-threaded relation with thebowl supporting ring whereby, when the bowl is rotated in relation tothe ring, its elevation is adjusted, a locking ring in screw-threadedrelation with the bowl and means for holding it against rotation inrelation to the bowl supporting ring, spring means for normally applyingan upward thrust to the locking ring to eliminate thread clearancebetween the bowl and bowl supporting ring and tending to lock the bowlagainst rotative adjustment, and means for releasing said spring meansand for thereby permitting free rotation of the bowl in relation to thebowl supporting ring.

6. A system of bowl adjustment for a cone crusher having a main frame, abowl supported for adjustment on the main frame, a crushing head mountedfor movement in the main frame and defining a crushing cavity with thebowl, spring means for releasably restraining the bowl againstunintended adjustment under a predetermined amount of spring pressure,power means operatively associated with the spring means such thatoperation thereof overcomes and releases the spring means so thatadjustment of the bowl may take place, and additional power means foradjusting the bowl relative to the main frame when the releasable springmeans is released.

7. A system of bowl adjustment for a cone crusher having a main frame, abowl supported for adjustment on the main frame, a crushing head mountedfor movement in the main frame and defining a crushing cavity with thebowl, spring means for releasably restraining the bowl againstunintended adjustment under a predetermined amount of pressure, andpower means operatively associated with the spring means such that theoperation thereof compresses and releases the spring means so thatadjustment of the bowl may take place.

8. The structure of claim 7 further characterized in that the yieldingmeans for releasably restraining the bowl includes a plurality ofsprings disposed about the crusher, means for maintaining the springsunder compression and effective to exert the thrust of the thuscompressedfsprings between the bowl and main frame, and furthercharacterized in that the power means operatively associated with thespring means includes a plurality of hydraulic jacks positioned aboutthe main frame and disposed to apply a compressing thrust to the springsto compress them so that the springs will be overcome and the bowl willbe released for adjustment.

9. In a gyratory crusher, a circumferential main frame, a bowl mountedin screw-threaded relationship to the main frame and constructed to beadjusted by rotation thereof, and means for applying a limited,generally axial yielding upthrust to the bowl to releasably restrain itagainst movementin the main frame but constructed to be released so thatfree rotative adjustment of the bowl may take place, including a ring inscrew-threaded relation with the bowl, means-for holding the ringagainst rotation in relation to the main frame, and a plurality ofsprings disposed about the main frame, maintained under compression, andeffective between the ring and the main frame to thereby apply areleasable upthrust to the bowl through the ring.

10. The structure of claim 9 further characterized by and includingpower means for overcoming and compressing the springs to thereby permitfree rotation of the bowl in the main frame for adjustment thereof.

11. In a gyratory crusher, a circumferential main frame, 7

' ably restrain the bowl against rotative adjustmentin .the'

bowl supportingring, constructed to be released so that free rotativeadjustment of the bowl may .take place, including-meansior applyingayieldable and compressible upthrust to the bowl reactively effectiveimmediately between the bowl and bowl supporting ring to restrain thebowl againstrotative adjustment in the bowl supporting ring, andseparate means for eliminating the yieldable upthrust so that .the bowlmaybe freely rotated and adjusted.

12..In a hydraulic system. of bowl release for a .cone crusher having amain frame, a bowl supporting ring on said mainframe, a bowl; adjustableon. said ring, and a I to a predetermined excursion of one of more ofsaid spring release normally holding. said ring fixed. on said mainframe, butlfoimiedand adapted to, permititsmovev ment in relation to themainframe when' uncrushable material .is present-in .the crushingcavity, yielding means for normally. holding the. bowl againstfunintended movement in relation-to thelbowl supporting. ring, aplurality of hydraulic. jacks circumferentially arranged-about thecrusher, and thrustmembers mounted about the framej and aligned withandin position .to-be contacted by said jacks, means for releasingthe.yielding means between the bowl: and. the-bowl supporting. ringinirespon'se. to' a predeterminedminimum excursion of. one or.v more ofsaid thrust;members,i.and. means for directing a lifting on'said mainframe, ..means. for. looking it against'unin tended adjustingm'ovement,ajspring release normallyholding-saidbowl: fixed ,on saidmain framebutformed and adapted to. permit its, movement. in relation to thethrust members, and meansiforliftingthebowl support ing ring from'themain frame, 1 r

15, In. a hydraulic system of bowl'releasefor' a cone crusher. having amain frame, a bowl audjustably supported on the. main 'frarne a crushinghead mounted for'movement'in the main frame and defining a crush ingcavity'with the bowl, means for restraining'the bowl againstunintended'adjusting movement, a spring release normally holding; thebowl fixed on themainframe constructedto permit it to move in relationto the main frame when uncru'shable'material is present inthe'crushingcavity, and separate power means operatively associatedwith.the restraining means, spring release and bowl such that initialoperation of the separate power means releases the restrainingmeans sothat the bowl'maybe adjusted and further operation of the separate powermeans lifts the'bowl to clear uncrushable material.

16. A hydraulic system: of bowl release for a cone crusher having..amain frame, a bowl'supported on the mainframefdr both-adjustment andrelease, a crushing head mounted for movement in' the main frame anddefining a crushing cavity with the'bowl, means for releasablyrestraining the bowl against unintended adjustment, a spring. releasenormally holding-the bowl fixed on the frame under pressure and,constructed' to permit the bowl to release toa release position inrelation to themain frame when uncrus'hable material is present in. thecrushing cavity, and power means operatively associated with' thereleasable. restraining means, the spring release and the, bowlsuch'thatyinitial operation'thereof releases the releasable restrainingmeans so that adjustment of the'bowl may take place: and furtheroperation moves the bowl to its releaseposition toallow'uncrushable'material to. be cleared from the-crushing cavity.

17; A hydraulic system of bowl adjustmentand' bowl release fora-ponecrusher haVing-a'main frame, a bowl supported. on the main frame forboth adjustment and release, a crushing head' mounted for movement inthe mai frame and defining a crushing cavity with thebowl, means forreleasably restraining the bowl against uninitended adjustment, a'springrelease normally holding 'the bowl fixed onthe frame under pressure andconstructed main frame. when i uncrushableamaterial is present .in. the

crushing cavity, av plurality of hydraulic. jacks circumfer entiallyarranged .abouLthe. crusher,.means for-releasing the, locking. means:between; the. bowl. and framefiin; responsetoxapredetermined'desserexcursion of one or more of. said, jacks, andmeans...for.,directing; a.-' l i fting thrust 'against the bowl. in.response to.. aPIedeterrnined greaterrexcursion of. one-ormore ofsaid;jacks. V

'14 In ahydraulic system' of bowlrelease; for. a cone crusher. havingaarnain frame aibowl supporting I ring on to permit'the bowl toreleaseto a release position in relation .to the main frame whenuncrushable' material is present in the crushingvcavityrpower meansoperatively associated with the; releasable restraining means, the,spring release andthe bowlsuch thatoperation'thereof releases thereleasable restraining means so that adjustment of the' bowl may takeplacegfand movesfthe .bowl

to its release position to allownncrushable 'material't o becleared'from thecrushing-cavity; and additional power means foradjustingthe..bowl relative to the main frame saidmainframe, a bowl adjustablegon.sai'djring', iand-a' spring, release normally holdingsaidiring..fixedon said ment in; relation "to, the mainframe when uncrushable mainframe, but formed and .adaptedio :p'e'rmit its movematerial is presentinthe crushing cavity,;yieldingfmeans and aligned withfand in 1 positionto be contacted by said jacks, means for-releasing the yielding means'be-' tween the bowl and? the. bowLsupporting ring-in response when thereleasable restraining means is released. I

R eferences lite'dlin the file-iofi thistpatent l :UmrEn sra rEsPA'rE rsI 2,550,098

, Traylor Apr. .24, 1951 2,680,511.} Bjarme June 8, 1954 2,687,257Rumpel 'Aug. 24, 1954 2,747,804 Rumpel May29,21956 ,'2,791,'383Kjelgaard e May. 7, 19.57

;-Feb. 6, 1962

1. IN A GYRATORY CRUSHER, A CIRCUMFERENTIAL MAIN FRAME WITH AN OUTWARDLYEXTENDING FLANGE ADJACENT ITS UPPER EDGE, A BOWL SUPPORTING RINGTILTABLY MOUNTED ON SAID FLANGE AND MOVABLE UPWARDLY THEREFROM, A BOWLMOUNTED ON THE BOWL SUPPORTING RING, YIELDING MEANS FOR NORMALLY HOLDINGTHE BOWL SUPPORTING RING DOWNWARDLY AGAINST SAID FLANGE ANDSUBSTANTIALLY FIXED IN RELATION TO THE MAIN FRAME WHILE PERMITTINGOVERLOAD RELEASE, INCLUDING A PLURALITY OF BOWL HOLDING AND RELEASESPRINGS, THEIR UPPER ENDS ABUTTING THE LOWER SIDE OF SAID MAIN FRAMEFLANGE, MOVABLE ABUTMENTS FOR THE LOWER ENDS OF THE SPRINGS, AND SPRINGBOLTS PASSING THROUGH APERTURES IN SAID MAIN FRAME FLANGE, ANDCONNECTING SAID ABUTMENTS AND BOWL SUPPORT-